Algae in My Aquarium's Seal

Healthy aquariums will grow algae. Some algae, such as macro and green, provide a beneficial service to the ecosystem by digesting harmful toxins. However, excessive algae growth is generally an indication of poor water quality. Algae growth, even when beneficial, may not be limited to the confines of acceptable areas. Growth on glass, decor and on or in the aquarium seals is generally discouraged. Special care is required when removing algae embedded in silicone aquarium seals to prevent seal damage during the cleaning process.

  1. Water Quality

    • Algae growth is encouraged when excessive concentrations of nutrients are present in the water. Nutrients consumed by algae include nitrates, phosphates and silicates. Reduce the concentration of nutrients by performing regular water changes. Avoid over-feeding your fish, and regularly siphon debris from the water to prevent nutrient buildup.

    Controlling Growth

    • Algae growth is dependent on adequate light to ensure photosynthesis occurs. Restrict the light provided to the aquarium to reduce algae growth. Place the aquarium in a location where direct sunlight exposure will not occur.

    Algae Removal

    • Remove algae from the seal with a new soft toothbrush. Rinse the toothbrush prior to using it in the aquarium to ensure contaminants are removed. Lightly brush the surface of the aquarium seal and press the bristles into the pockets of algae. Pocked or pitted seals may require more aggressive scrubbing. Aquarium scrub brushes, paper towels and your fingers may be used to remove algae. Do not cut or peel the seal away from the aquarium glass, as leaks may form.

    Seal Replacement

    • Pitted or damaged silicone seals should be replaced. The small holes in the seal material may harbor algae that resist manual removal. Drain and dry the aquarium. Remove all old seal material. Reseal the aquarium glass with 100 percent pure aquarium-grade silicone. Smooth surfaced silicone seals provide fewer growth points than rough edged seals.